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2015 ; 15
(2
): 321-34
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The neuroanatomical delineation of agentic and affiliative extraversion
#MMPMID25712871
Grodin EN
; White TL
Cogn Affect Behav Neurosci
2015[Jun]; 15
(2
): 321-34
PMID25712871
show ga
Extraversion is a fascinating personality dimension that consists of two major
components, agentic extraversion and affiliative extraversion. Agentic
extraversion involves incentive motivation and is expressed as a tendency toward
assertiveness, persistence, and achievement. Affiliative extraversion involves
the positive emotion of social warmth and is expressed as a tendency toward
amicability, gregariousness, and affection. Here we investigate the
neuroanatomical correlates of the personality traits of agentic and affiliative
extraversion using the Multidimensional Personality Questionnaire Brief Form,
structural magnetic resonance imaging, and voxel-based morphometry in a sample of
83 healthy adult volunteers. We found that trait agentic extraversion and trait
affiliative extraversion were each positively associated with the volume of the
medial orbitofrontal cortex bilaterally (t's?? 2.03, r's?? .23, p's?< .05).
Agentic extraversion was specifically and positively related to the volume of the
left parahippocampal gyrus (t?= 4.08, r?= .21, p?< .05), left cingulate gyrus
(t?= 4.75, r?= .28, p?< .05), left caudate (t?= 4.29, r?= .24, p?< .05), and left
precentral gyrus (t?= 4.00, r?= .18, p?< .05) in males and females, and the
volume of the right nucleus accumbens in males (t?= 2.92, r?= .20, p?< .05).
Trait affiliative extraversion was not found to be associated with additional
regions beyond the medial orbitofrontal cortex. The findings provide the first
evidence of a neuroanatomical dissociation between the personality traits of
agentic and affiliative extraversion in healthy adults.
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